1# SPDX-License-Identifier: GPL-2.0 2 3config BTRFS_FS 4 tristate "Btrfs filesystem support" 5 select CRYPTO 6 select CRYPTO_CRC32C 7 select LIBCRC32C 8 select ZLIB_INFLATE 9 select ZLIB_DEFLATE 10 select LZO_COMPRESS 11 select LZO_DECOMPRESS 12 select ZSTD_COMPRESS 13 select ZSTD_DECOMPRESS 14 select RAID6_PQ 15 select XOR_BLOCKS 16 select SRCU 17 18 help 19 Btrfs is a general purpose copy-on-write filesystem with extents, 20 writable snapshotting, support for multiple devices and many more 21 features focused on fault tolerance, repair and easy administration. 22 23 The filesystem disk format is no longer unstable, and it's not 24 expected to change unless there are strong reasons to do so. If there 25 is a format change, file systems with a unchanged format will 26 continue to be mountable and usable by newer kernels. 27 28 For more information, please see the web pages at 29 http://btrfs.wiki.kernel.org. 30 31 To compile this file system support as a module, choose M here. The 32 module will be called btrfs. 33 34 If unsure, say N. 35 36config BTRFS_FS_POSIX_ACL 37 bool "Btrfs POSIX Access Control Lists" 38 depends on BTRFS_FS 39 select FS_POSIX_ACL 40 help 41 POSIX Access Control Lists (ACLs) support permissions for users and 42 groups beyond the owner/group/world scheme. 43 44 If you don't know what Access Control Lists are, say N 45 46config BTRFS_FS_CHECK_INTEGRITY 47 bool "Btrfs with integrity check tool compiled in (DANGEROUS)" 48 depends on BTRFS_FS 49 help 50 Adds code that examines all block write requests (including 51 writes of the super block). The goal is to verify that the 52 state of the filesystem on disk is always consistent, i.e., 53 after a power-loss or kernel panic event the filesystem is 54 in a consistent state. 55 56 If the integrity check tool is included and activated in 57 the mount options, plenty of kernel memory is used, and 58 plenty of additional CPU cycles are spent. Enabling this 59 functionality is not intended for normal use. 60 61 In most cases, unless you are a btrfs developer who needs 62 to verify the integrity of (super)-block write requests 63 during the run of a regression test, say N 64 65config BTRFS_FS_RUN_SANITY_TESTS 66 bool "Btrfs will run sanity tests upon loading" 67 depends on BTRFS_FS 68 help 69 This will run some basic sanity tests on the free space cache 70 code to make sure it is acting as it should. These are mostly 71 regression tests and are only really interesting to btrfs 72 developers. 73 74 If unsure, say N. 75 76config BTRFS_DEBUG 77 bool "Btrfs debugging support" 78 depends on BTRFS_FS 79 help 80 Enable run-time debugging support for the btrfs filesystem. This may 81 enable additional and expensive checks with negative impact on 82 performance, or export extra information via sysfs. 83 84 If unsure, say N. 85 86config BTRFS_ASSERT 87 bool "Btrfs assert support" 88 depends on BTRFS_FS 89 help 90 Enable run-time assertion checking. This will result in panics if 91 any of the assertions trip. This is meant for btrfs developers only. 92 93 If unsure, say N. 94 95config BTRFS_FS_REF_VERIFY 96 bool "Btrfs with the ref verify tool compiled in" 97 depends on BTRFS_FS 98 default n 99 help 100 Enable run-time extent reference verification instrumentation. This 101 is meant to be used by btrfs developers for tracking down extent 102 reference problems or verifying they didn't break something. 103 104 If unsure, say N. 105